Furnace for roasting ores.



No. 376,567. v PATENTBD-JAN. 14, 1908.

v A. 1). LEE.

FURNACE FOR RO-ASTING ORBS.

APPLICATION TILED APB-3. 1907.

4 SHEETS-SHEET 1.

Wi'bwsses. liwentor: z?

- fllvafi.Lec,

"No. 876,567. I PATENTED JAN; 14,1908.

' A. 1). LEE.

I FURNACE FOR ROASTING ones.

4 sums-8am: 2.

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-PATENTED JAN.1'.4, 1908.

- I A. D. LEE.

FURNACE FOR ROASTING DE APPLICATION FILED APR. 3, 1907.

4 SHEETS-SHEET 3.

liwentor;

PATENTED JAN. 14, 1908.-

A. 1). LEE. FURNACE FOR ROASTING ORES.

APPLICATION mum APR. 3. 1901.

' 4 SHEETS-SHEET 4.

n filvluaLce,

UNITED. STATESPATENT OFFICE.

ALVA D. LEE, or 'BRooKLm MASSACHUSETTS.

FURNACE son noasrme ORES.

sfolk and State of Massachusetts, have in vented certain new and useful Improvements 1n Furnaces fcr Roasting Ores, of which the following 1sa specifipation.

.This invention relates to roasting fur- 10 naces and has for its object the production of a furnace which ma be charged with ore from the top and w 'ch will thoroughly mix the ore as it Ipasses from the top to the bottom so that t e greatest amount of the 15 surface of said oretwill be resented to the ..actin; 0f the products or combustion as .they' pass from the bottom to the outlet at the top.

The nvention consists in certain novel of the furnace 20 featuresj of construction and arrangement of partSlwhich will be readily understood by reference to the description of the draw ings,andto the claims hereinafter given.

' Of the drawings: Figure l'represents an 25-elevatio'n of a furnace embodying the featuresof this invention. Fig.2 represents a vertical section of the same.

Fig. 2, and Fig. 4 represents a horizontal -30 section on line 4-4 on Fig. 2. l

-Similar characters designate like parts ra lugs. n "drical easing having secured to the top thereof a conical casing 11 in axial line j therewith." The upper end of the conical .section 11 terminates in an outlet 12 through whichthe products of combustion -40 are permitted to pass from the interior of the furnace, The casing has secured to lts mtenor face a lining 14 of firebrick ;,through which'extends the tangential open- 15 in each of which is mounted an oil '45 burner.

j casing 10 ismOunted and in the bottom-of a "WelllS is mounted an annular bed 19 in a Beneath the floor 17 on which said hannel of which is mounted a plurality of ollers 20 on which the disk member'21 is adapted to be revolved by means of the pinion 22 meshing with the gear teeth 23 on the I Zunder face of said revoluble member 21.

The pinion 22 is mounted upon a shaft 24 revolved in an suitable manner. The bed 63 '19 is embedde in concrete and at the center 0: 's aid tube is embedded in asimilar manner Specification of Letters Patent Application filed April 3.1907; Serial No. 366.065;

, Fig. 3 represents a horizontal section on line 33 on the drawings, 10' represents a cylin-' l?atented 58.11.14, 1908.

a support 25 carrying a plurality of anti-friction members 26 upon w ich reststhe hub 27 of said 'revoluble member 21. The hub of this disk-like member 21 has mounted there' in a hollow cylindrical shaft 23 extending up- Wardly in axial line-with said hub 27. The central hole of this shaft 28 communicates with an "nlet pipe 29 through which a cooling agent may be admitted to the bore of said shaft 28 to be utilized as hereinafter described. To the upper end of the shaft 28 is secured a disk 30 and intermediate the hub 27 and the disk 30 are other disk members 31, 32,.and 33 each of which is of greater diameter than the disk next above.

. 'Interposed between the disks 30 and 31 is the tubular member 34 of greater diameter than the exterior of that portion of the shaft 28- Which passes through the same in axial line therewith." In like manner a tubular member 35 of larger diameter is interposed between the disks 31 and 32 while another 38 and the plate 39 is secured a covering 40 of firebrick or similar material capable of withstanding the intense heat of the-furnace.

That portion of the covering 40 which is above the disk members30, 31, 32, and 33 has its upper face inclined to form suitable shelves "41, 42, 43, and 44, the outer edge of each of which, extends further from the axis of the shaft 28 than the shelf immediately above.

The casing 11 has secured to the interior face thereof a plurality of inwardl extending annular plates each pair of w iich are secured together at their inner edges intermediate the shelves41, 42, 43, and 44. These lates 45 have secured thereto a lining 46 of standing the intense heat of the furnace. This lining 46 extends to the top of the casing 11 and is continued'through t e outlet ipe 12. The lining 46 forms a plurality o inclined shelves 47, 48, 49, and 50 extending inwardly beneath the projecting shelves 41, 42, 43, and 44 of the revoluble central member.

Each of these projectin shelves 41, 42, 43,

and 44 has secured to t 'e outer and under u'ebrick or similar material capable of witha blade 52 as the shelf revolves.

face thereof a plate 51, the, lower edge of which cooperates with the top of a shelf 47, 48, 49, and so that as the member 21 revolves about its axis these plates 51 -will scrape the ores or other material collected upon the shelves 47, 48, 49, and 50 and force them therefrom permitting them to drop onto the shelf immediately below forming part of the revoluble central member. Cooperating with each of these shelves 41, 42, 43, and 44 of said revoluble central member are a plurality of fixed inclined blades 52 which, as the central member with the shelves 4], 42, 43, and +1 revolve, scrapes the ore from said shelves and causes it to drop from each of said shelves onto the fixed shelf inunedia'tely below. The ore admitted to the furnace is charged from a floor above the furnace through the charging cone 54 which delivers the'ore to the furnace Ill axial line with the revoluble shaft .38 so that as the ore passes through the charging cone 54- it is delivered it on the inclined shelf 41 and scatters radia l v thereon to be scrap-ed therefrom by the These mixing blades f2 are secured to pipes 55 extending inwardly from the interior of the casing 11. The iower end of the pipe is connected to a suitable pump 56 which forces water or some other cooling agent from a suitable tank 57 through the pipes 55 on either side of the interior of the casing 11, said pipes passing through the casing at its u per end and comprovided with a suitable va :municating with an annu ar pipe 58 on the exterior of said casing from w rich the waste water is discharged through the pipe 59. Ac-

cess to the various shelves on the interior of the casing 10 and 11 is secured through openings in the exterior of the casing which are normally keptclosed by the doors 60, the. inner face of which is protected by firebrick 62 in a w ell-known manner.

To the exterior of the casing 11 is secured the brackets 63 supporting an annular air tube 64 and an annular oil tube 65, air being sup )lied to the tube 64 from the compressed air holder 66 through the pipe 67 which is ve 63 therein. he oil tube is supplied s ith oil from the oil tank 69, said oil being forced into said tube 65 under pressure through a pipe 70 by means of the pump 11. v

The pumps 56 and 71 are bot-hdriven by a shaft 72 mounted in bearings .16 and driven by a belt 74 upon a pulley 75 secured thereto. A tank 76 containing steam is connected by i a a line of piping 77 to an annular tube 78 within the casing 11 inunediately above the casing 10. The steam admitted to this annular tube 78 is subjected to the intense heat of the furnace and superheated thereby. Radiating fronrthis annular-tube 78 a e a plurality of pipes 7!) each ofwhich communicate with an oil burner 80 extending into an opening 15, said burner being supplied with compressed air through the pipe 81 from the annular tube 64 while oil from the annular tube 65 is delivered to said burner through the pipe 82. This burner forms no part of the present invention and may be of any well-known construction. The mouth of the burner St) extends into the tangential passages 15 and delivers a flame directly into the path of the ore which is carried upon the shelf 39 of the revoluble central member, the path of movement of said ore being in the direction of the arrow (1 on Fig. 4.

The firebrick lining 14 of the casing 10 at its upper level projects over the shelf 39 except at one point, 83, where it is cut away to permit the ore upon the shelf 39 to pass downwardly upon the shelf 84, the ores on the shelf 39 being deflected into this cutaway portion by means of the .curved blades 52. Y

The ore upon the shelf 84 is carried with the revolublc member about its axis and in so doing comes into contact with the deflecting plate by which the ore. is deflected through the exit 86 and discharged from the furnace. From the steam pipe 77 extends a valved pipe 87 the mouth of which extends into the trench above the shelf 84 permitting a jet of steam to act-upon the ore before its final discharge from the. furnace to disintegrate it and remove therefrom any volatile metals such as sulfur and arsenic which may be included therein.

The fixed blades 52 co-acting with the shelves 41, 42, 43,,and 44 are curved similar to 1 plowshare so that as the ores are moved against them the ores will be turned upon the shelves causing a thorough mixture 0 the ores and continually bringing new surfaces to the action of the-heat passing through the furnace. I

The plates 51 upon the rcvoluhle member co-acting with the shelves 47,48, 4!), and 50 simpl) act as scrapers to remove therefrom any ore which may have landed upon these shelves and cause it to be discharged onto the revolublc shelf beneath.

The casing is made conical in shape so that as the heat. generated in the casing 10 passes upwardly through the annular passages between the rcvoluble member and the lining 46 the ame p opm'tion of heat practically maintained at the top as at the bottom owing to the smaller area.

The flames from the burners 80 pass upwardly in the form of a vortex around the revoluble member to the outlet at the top, these flames passing in the opposite direction to the movement of the ore on its way to its discharge outlet at the bottom. This action subjects the ore to an intense heat throughout its movement in the furnace. the ore being continually passed transversely through the flames by the action thereon of the various blades and scra wrs. This makes a very effective roasting furnace which permits of a continuous supply of ore'tobe fed to the top where it is immediately subjected to the intense heat from the burners passing through the tortuous passages on its way to the outlet 12, the ore in passing downwardly being tumbled from one shelf to another, first upon a movable shelf and then upon a fixed shelf, being turned over when on the movable IO shelves by mearis of the curved blades 52 and thereby thrown upon inclined fixed shelves from which they are scraped by means of a movable blade 51. This operation is repeated several times as the ores '15 pass from the top to the bottom where they are delivered into any suitable receptacle (not shown).

' The advantages to be derived from a furnace of this construction and-the operation thereof it is believed will be fully apparent without any furtherdescription.

Having thus described my invention, I claim:

1. In a roasting furnace provided with an ore inlet at the top, the combination of a hollow revoluble member beneath said inlet; a plurality of rojecting shelves secured thereto at various evels; a plurality of cylindrical casings surrounding said revoluble member between said shelves; and means for supplying heat to the bottom of said furnace.

2. In a roasting furnace rovided with an ore inlet at the top, the com ination of a revoluble member beneath said inlet provided with a plurality of projecting shelves at various levels, each shelf being of greater diameter than the one above it a casing snrround ing said revoluble member; and means for supplying heat to the bottom of said furnace.

40 3. n a roasting furnace provided with an orc inlet at the top, the combination of a revoluble member beneath said inlet provided with a plurality of rojecting shelves at various levels, each she f being of greater diameter than the one above it; a casin surroundmg said'revolub'le member; fix blades secured to the casing cooperating with each shelf; andmeans for supplying heat to the bottom of said furnace.

so 4. In a roasting furnace rovided with an ore inletat the top, the com ination of a revolubl e member beneath said inlet rovided with a' plurality of downwardly inclined projecting shelves at various levels and of various diameters; a casing surrounding said revoluble member; and means for supplying heat to the bottom of said furnace.

5. In a roasting furnace rovided with an ore inlet at the top, the com ination of a revolublc member beneath said inlet provided with a pluralityof projecting shelves at rariouslevels; a casing surrounding said revolulble member an annular extension on said casing beneath each shelf; and means for supc', plying heat to the bottom of said furnace.

6. In a roasting furnace rovided with an ore inlet at the top, the com ination of a revoluble member beneath said inlet provided with a plurality of projecting shelves at various levels; a casing surrounding said revoluble member; an annular extension on said casing beneath each shelf; a plurality of blades on said revoluble member cooperating with each extension. i

7. In a roasting furnace provided with a ore inlet at the top, the combination of a rev- -oluble'member beneath said inlet provided with a plurality of projecting shelves at various levels; a casing SUIIOllHdlIlg sa d 1evoluble member; an annular extension on sald casing beneath each shelf, the inner wall of' each of whichis ata greater distance from the axis of said revoluble member than that of the extension above.

8; In a roasting furnace provided with an ore inlet at the top, the combination of a revoluble shaft; a casing mounted thereon having radial arms at various levels; a fire-brick exterior covering for said casing and said arms forming a plurality of shelves: an exterior furnace casing; and means for supplying heat to said furnace.

9. In a roasting furnace provided with an ore inlet at the top, the combination of a hollow revoluble casing having radial arms at var ous levels; a fire-brick exterior covering for said casing and said arms forming a plurality of shelves of successively greater diameters from top to bottom ;'an exteriorfurnace casing;'andmeansfor supplying heat to said furnace.

10. In a roasting furnaceprovided with an ore inlet at the top, the combination of a hollow'revoluble casing having radial arms at various levels; a fire-brick exterior covering for said casing and said arms forming a.

plurality of inclined shelves of successivcl greater diameters from top to bottom: an-

12. n a roasting furnace provided with an.

ore inlet at the top, the combination of a hollow revoluble shaft; a casing surroundii 0 said shaft with which it revolves and se arated therefrom by an annular space said casing having radia arms at various levels: a fire-brick exterior covering for said. casirn and said arms forming a plurality of inclined shelves; an exterior furnace casing; an interior facing of fire-brick for said exterior plurality of shelves: an exterior furnace casing having inward extensions beneath each revoluble shell; and means for supplying heat to-saitl l'urnace.

I3. in a roast ing furnace provided with an ore inlet at the top. the combination of a hollow revolublc shal't: a casing surrounding said shalt with which it revolves and separated therefrom b v an ammlar space said casing having radial arms at various levels; a fire-brick exterior covering for said casing and said arms forming a plurality of shelves; an exterior furnace casing: means for supplying heat to said furnace; and means for supptving a cooling agent to the interior of said revoluble casing. i

H. la a roasting furnace provided with an ore inlet at the top, the combination of a h llow revoluble casing having radial arms at various levels: a lire-brick exterior covering for aid casing and said arms forming av hmdity of shelves: an exterior furnace a ing: means for supplying heat to said hn'nacc: means for supplying a cooling agent In the interior of said revoluble casing; is base: a|ttil'|'iction members between said base and revoluble casingfand means for l'enilving aid casing.

)5. in a roasting l'uruacc provided with an i ore inlet at the top, the combination of a hollow revoluble casing having radial arms at various levels: a lire-brick exterior covering for said casing and said arms forming a plurality .ol' shelves: an (Xtttiut furnace casing; means for supplying heat to said lurnace: an ore exit at. the bottom of said furnace: and a detlectorcooperating with said revoluble member to secure the discharge of the ore through said exit H5. in a roasting l'urnac: provided with an I ore inlet at the top. the combination iol' a hollow revoluble casing having radial arms at various levels: a lire-brick exterior covering for said casing ud said arms forming a casing: means for supplying heat to said revolubtc casing: and a )luralitv ol' burners at the bottom of said l urnace adapted to direct their llames into the path of movement of said ore.

1?. In a roasting l'urna ore ihlet. at the top, the combination ol a hollow revoluble casing having radial arms t at various levels: a lire-brick exterior covering for said casing and said arms forming a plurality'ot slit-hes: an exterior furnace casing: means for supplying heat to said l'ur nacc: means forsupplving a cooling agent to the interior of aid rcvoluble casingi an ore exit at lhebottom of said furnace: and a dcllector cot'iiwrating with said revoluble member to secure the discharge of the ore through said exit.

I.\. in a roasting furnace provided with an ore tflitlat the top, the combination of at hollow re'volublc casing having radial arms are,

at various levels; a fire-brick exterior covering for said casing and said arms forming a plurality of shelves; an exterior furnace casing; means for supplying heat to said furnace; means for supplying a cooling agent to the interior of said revoiuble casing; a base anti-friction members between said base and revoluble easing; means for revolving said casing; an ore exit at the bottom of said furnace; and a deflector cooperating with said revoluble member to secure the discharge of the ore through said exit.

19. Ina roasting furnace provided with an ore inlet at the top, the combination of a revoluble member beneath said inlet provided with a plurality of projecting shelves at; various levels, each shelf being of greater diameter than the one above it: :1 casing surrounding said revoluble member; fixed blades secured to the casing cooperating with each shelf; means for applying a cooling agent to said iixed blades; and meaits for supplying heat to the bottom of said furnace.

20. In a. roasting furnace provided with an on: inlet at the top, the combination of a hollow revoluble member beneath said inlet;

' a casing revoluble therewith but separated therefrom by an' annular space provided with a plurality of projecting shelves at various levels: a casing surrounding said revoluble member; a plurality of openings through said casing at various levels to afford access to said shelves; closures therefor; and means for supplj ing heat to the bottom of said furnace.

21. In a roasting furnace provided with an ore inlet at'the top, the combination of a revolubie member beneath said inlet provided with -a plurality of projecting shelves at \arious levels; a casmgigsurrounding said revolublc member provided with a plurality of inwardly projecting shelves: and. a plurality ol' burners tangentially located and adapted to direct their tlames in the path of movement of the orcs on said shelves.

22. in a roasting furnace provided with an ore inlet at the top, the combination of a revohtble member beneath said inlet provided with a plurality of projecting shelves cc provided with an L at various levels: a conical casing snrround ing said revoluble member provided with a plurality ol' inwardly projecting shelves; and a pluralitvof burners adapted to direct their llames in the path of movement of the ores on said shelves.

23. in a roasting furnace provided with an ore inlet at the top the combination of a revoluble member beneath said inlet provided with a pluralitwgf projecting shelves at. various levels; a casing surrounding said revoluble meinbcr-provided with a plurality of inwardly projecting shelves; and a plurality of burners tangentially located and adapted to direct their llames in the path of l movement of the ores on said shelves and i In P ss to the outlet'at tl l V 1e 0 VON. t p in the num of a up; f a urnace provided with an t i the combination of a mt h r P fi g the ore from the top to the ni l ii a distorted helical path; and tan- H l\ (\Tit'ts e; I said fur 1 H through the alls in I i .1( and adapted to pro ect flames m H t \0 interior thereof in such a manner as to l l Hm P ucts of combustion to be t "I from the bottom of the furnace to the (i -i: t wrmf m we P h of movement of said u:- -n. In a roam orc in et {l furnace l an P, the C(HllblflzltlOH of a 1 means for passing the ore from the top to the l bottom in a distorted helical path; and tangent-ial devices extending through the walls of said furnace and adapted to project flames into the interior thereof insuch a manner that the products of combustion will be forced from the bottom of the furnace to the. top in the path of movement of'said ore and in the opposite direction.

day of March, 1907.

ALVA D. LEE. Vlitnesses WALTER E. LOMBARD,

EDNA C. CLEVELAND.

Signed by me at Boston, Mass, this 27th 

